9.3

CVE-2026-77138: Remote Code Execution in extension "HTML5 Video Player vs. Powermail" (html5videoplayer_powermail)

Deferred
Published 25-08-2026Last modified 25-08-2026

Vulnerability summary

CVE-2026-77138 is a critical (CVSS 9.3) Deserialization of Untrusted Data vulnerability in typo3 extension "html5 video player vs. powermail". EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53.8% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.3 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.3/10
010
Critical · v4.0 (CVE.org)
EPSS score
0.72%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 25-08-2026
    PublishedVulnerability first disclosed.
  2. 25-08-2026
    Last modifiedVulnerability information updated.

Description

The extension fails to safely process untrusted client input of an attacker-controlled cookie directly to PHP's unserialize(). A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.72%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.72% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Typo31 product

1 vendor · 1 product

References

1 links